/*
 * Program to find highest power of 2 <= input.
 */
#include <stdio.h>

int main(void) {

	int n;
	printf("enter n\n");
	if (scanf("%d", &n) != 1) {
		printf("not number\n");
		return 1;
	}

	int power = 1;

	while (power <= n) {
		power *= 2;
	}
	power /= 2;
	printf("highest power of 2 %d\n", power);

	return 0;
}